Query: alzabo::runtime::foreignkey
OS: debian
Section: 3pm
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
Alzabo::Runtime::ForeignKey(3pm) User Contributed Perl Documentation Alzabo::Runtime::ForeignKey(3pm)NAMEAlzabo::Runtime::ForeignKey - Foreign key objectsSYNOPSIS$fk->register_insert( $value_for_column ); $fk->register_update( $new_value_for_column ); $fk->register_delete( $row_being_deleted );DESCRIPTIONObjects in this class maintain referential integrity. This is really only useful when your RDBMS can't do this itself (like MySQL without InnoDB).INHERITS FROM"Alzabo::ForeignKey" Note: all relevant documentation from the superclass has been merged into this document.METHODStable_from table_to Returns the relevant "Alzabo::Runtime::Table" object. columns_from columns_to Returns the relevant "Alzabo::Runtime::Column" object(s) for the property as an array. cardinality Returns a two element array containing the two portions of the cardinality of the relationship. Each portion will be either '1' or 'n'. from_is_dependent to_is_dependent Returns a boolean value indicating whether there is a dependency from one table to the other. is_one_to_one is_one_to_many is_many_to_one Returns a boolean value indicating what kind of relationship the object represents. is_same_relationship_as ($fk) Given a foreign key object, this returns true if the two objects represent the same relationship. However, the two objects may represent the same relationship from different table's points of view. register_insert ($new_value) This method takes the proposed column value for a new row and makes sure that it is valid based on relationship that this object repre- sents. Throws: "Alzabo::Exception::ReferentialIntegrity" register_update ($new_value) This method takes the proposed new value for a column and makes sure that it is valid based on relationship that this object represents. Throws: "Alzabo::Exception::ReferentialIntegrity" register_delete ("Alzabo::Runtime::Row" object) Allows the foreign key to delete rows dependent on the row being deleted. Note, this can lead to a chain reaction of cascading deletions. You have been warned. Throws: "Alzabo::Exception::ReferentialIntegrity" id Returns a string uniquely identifying the foreign key. comment Returns the comment associated with the foreign key object, if any.AUTHORDave Rolsky, <autarch@urth.org> perl v5.8.8 2007-12-23 Alzabo::Runtime::ForeignKey(3pm)
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